Exhaust-silencer



J. ERNST.

EXHAUST SlLENCER.

APPLlCATlON FILED AUGJl, 19x9.

III/1,1 5

{MA- MW Patented Aug. 16, 1921.

UNITED STATES PATENT OFFICE.

J'OHANN ERNST, OF PADERBORN, GERMANY.

EXHAUST-SILENCE.

the side facing its outlet-end, further of double-cone shape, thirdly ofa pitch increasing from its middle toward both ends,

and fourthlyl with a central bore whichiscylindrical in its middle andconically increased toward both ends.

Thereby, the exhaust gases flowing through said helix are set inwhirling motion and find an effective resistance on the bulbed walls ofthe helix, which is the greatest at the middle of the latter, where thepitch of the helix is very low and the central bore rather small, whilethe admission as well as the escape of the exhaust-gases is facilitatedby the pitch of the helix as well as its central bore being graduallyincreased toward its inlet and outlet ends. ()wing to the double-coneshape of the helix and the different areas between the single threads ofthe helix, the exhaust-gases receive, moreover, different kinds ofmovement during their way through the latter. By theparticular design ofhelix, dead angles are avoided and a settling-down of the products ofcombustion does not take place@ The dimensions ofthe improvedexhaustbination,

Specification of Letters Patent. Patented Aug. 16, 1921. Applicationfiled August n, 1919. Serial No. 316,904.

silencer are so determined that the exhaust is still audible with a lowspeed of the motor, for controlling the proper working of the latter,while with a high speed a perfect silencing is obtained.

In the accompanying drawing: Figure 1 is a central section through theimproved exhaust-silencer, While Fig. 2 is an endview of one half of thesame.

The arrow 1 indicates the admissiorrorifice of. the exhaust-silencer; 2designates the open-ended casing of the same of doublecone shape whichconsists of two parts screwed together; 3, 4, 5, 6, 7, 8, 9, 10 are thesingle threads of the helix cone shape with increasing pitch toward bothends and which are bulbed on the side facing the outlet-orifice of thecasing; 11, 12, 13, 14 indicate the central bore through the helix, andcomically increased toward both ends.

What I claim, is An exhaust-silencer, comprising, in comcone shape and acorrespondingly shaped elix therein of a bulb formation on the sidefacing its outlet-end and of a pitch increasing from its middle towardboth ends, said helix having a central bore therein which is cylindricalin its middle and conically increased toward both ends, substantially asand for the purpose set forth.

In testimony whereof I have hereunto set my hand in the presence of twosubscribing wltnesses.

JOHANN ERNST. Witnesses:

THEopon Buns, HANS LANG.

which is cylindrical in its middle an open-ended casing of double-

